Turning mechanism for bridges.



No. 895,673. PATENTBD AUG. 11, 1908.

- F. DOR.

TURNING MECHANISM FOR BRIDGES.

APPLICATION FILED JAN. 6, 1908.

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Wl/zemsm UNITED STATES PATENT OFFICE.

FLORIMOND DOR, OF ST.-JOSSE-TEN-NOODE, BRUSSELS, BELGIUM.

TURNING MECHANISM FOR BRIDGES.

To all whom it may concern:

Be it known that I, FLoRIMoND DOR, a subject of the Kingdom of Belgium,residing in St.-Josse-ten-Noode, Brussels, in Belgium, have inventedcertain new and useful Imrovements in Turning Mechanism for ridges; andI do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to letters or figures of referencemarked thereon, which form a part of this specification.

The resent invention relates to a mechanism or turning bridges, actuatedby a fluid under pressure. The bridge is supported on a pivot movingvertically under the influence of this fluid and is driven by means of astud with which it is rovided, this stud moving in a helicoida grooveformed in the fixed support for the pivot.

In the accompanying drawing represent ing one embodiment of myinvention, Figure 1 is a vertical section of the device and Fig. 2 showsin elevation a detail of the helicoidal groove.

A piston 2 moves in a cylinder 1 under the influence of a fluid such aswater or air under ressure which is supplied through a pipe 3.

pon this piston there rests the lower extremity of a pivot 4 fixed tothe turning bridge (this bridge is not represented in the drawing). Thevertical displacement of this pivot 4 is provided for by a collar 5connected by stays 6 with the cylinder 1. 'A stud 7 is fixed to thepivot 4 and moves in a groove 8 formed in the collar 5. This groove isof helical form, its lower part ending in a small vertical portion 9.The bridge resting upon these supports, if the fluid under pressure isintroduced into the cylinder 1, the piston 2 rises, carrying with it thepivot 4. At the beginning of this stroke of the pivot 4 the stud 7 isdisplaced in the vertical part 9 ofthe groove 8 and the bridge riseswithout turning in such a manner as to release it from its fixedsupports, but as the pivot continues to rise the stud is displaced inthe helicoidal portion of the groove 8 so that a movement of rotation isimparted to the pivot and Specification of Letters Patent.

Application filed January 6, 1908.

Patented Aug. 11, 1908.

Serial No. 409,427.

consequently to the bridge. The extent of the helicoidal portion of thegroove 8 is necessarily proportionate to the angle through which it isdesired to rotate the bridge. WVhen the pressure beneath the piston iscut off the reverse action takes lace and the bridge is returned to itsclosec position.

In order that the weight of the bridge may rest upon the piston by theintermediary of the pivot 4 during the closing operation and not uponthe collar 5 by the intermediary of the bolt 7, it is advantageous toprolong the vertical portion of the groove downwards, as represented at10.

It should be noted that in case of accident to the piston 2 or to themechanism for distributing the fluid under pressure, it is onlynecessary to release the bridge from the support 4 and to cause it torotate on this support (which has become fixed) by any convenient means.

It will of course be understood that instead of fixing the stud to thepivot and providing a groove in the collar, the stud might equally wellbe fixed to the collar and the groove formed in the pivot.

Having now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, I declare thatwhat I claim is 1. In a device of the character described, thecombination of a frame having a vertical socket, a pivot memberrotatable in the socket, one of said members having a helicoidal groovecontaining a vertical portion at the lower end, the other of saidmembers carrying a pin 0 crating in said groove to rotate the pivot whenit is moved vertically in the socket.

2. In a device of the character described, the combination of a framemember having a vertical socket, and a pivot member rotatable in saidsocket, the socket member having a helicoidal groove having a verticalextension at its lower end, and a pin in the pivot member having itshead engaging the walls of said groove.

3. In a device of the character described, the combination of a framemember having a vertical socket, and a pivot member rotatable in saidsocket, the socket member having a helicoidal groove having a VerticaleX= l'n testimony that I claim the foregoing asv tension at its lowerend, and a pin in the my invention, I have signed my name in pivotmember having its head engaging the presence of two subscribingwitnesses.

walls of said groove, the frame member being FLORIMON D DOR. 5 providedwith a cylinder at its lower part, Witnesses:

and a piston in said cylinder secured to the HENRI RAOLOT,

pivot member to elevate the pivot. LUoIEN CROCHET.

